Bowling pins is the first thing that comes to mind but other than that I'm also wondering what objects commonly come in sets of ten.
Fingers
toes
10 decades
dimes
Top 10......
10 monkeys jumping on the bed
zoom zoom we're on the moon
dimes in a dollarnickels in a half dollaryears in a decadepennies in a dime
Some things that come in sets are:bookscoffee servicedishesfurnitureglasses (for drinking*)knivesmoviespots & pansrecordssheetsshelvesstationerystemwaretea servicetires*eyeglasses come in pairs
Quads.
Triplets.
Try sets of two. It is an easier number to handle.
Days of the week underwear.
1 dozen eggs.
Possibly dozens because a dozen is 12
results of roll no 10125
5 points on a star A < > V
a dozen eggs, or doughnuts, 12 days of Christmas
If he can only buy in sets and wants equal numbers, then he needs x sets of jerseys and y sets of visors, and if equal number then 45X = 50Y X = 50/45 times Y = 10/9 times Y the minimum set of Y is nine and x is 10 10 sets of jerseys = 450 9 sets of visors = 450